子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 1 | Induction timing motor | US14477026 | 1926-10-28 | US1778835A | 1930-10-21 | RUTTER ARGYLE R |
| 2 | Demand-indicator | US1331059D | US1331059A | 1920-02-17 | ||
| 3 | Electric meter. | US1911647154 | 1911-09-01 | US1085163A | 1914-01-27 | ROSE PAUL |
| 4 | Electricity-meter. | US1901076860 | 1901-09-28 | US759286A | 1904-05-10 | KALLMANN MARTIN |
| 5 | Electric meter. | US1900030249 | 1900-09-17 | US686507A | 1901-11-12 | CAUDERAY JULES |
| 6 | Electricity-meter. | US1899732945 | 1899-10-07 | US660987A | 1900-10-30 | EIBIG PAUL |
| 7 | Oscillating meter. | US1897664373 | 1897-12-29 | US638055A | 1899-11-28 | LOTZ ALBERT |
| 8 | Electric meter | US552309D | US552309A | 1895-12-31 | ||
| 9 | Electric meter | US549886D | US549886A | 1895-11-12 | ||
| 10 | Electric meter | US432654D | US432654A | 1890-07-22 | ||
| 11 | Electricity-gage | US308487D | US308487A | 1884-11-25 | ||
| 12 | Device for indirectly monitoring cumulative cost of utility consumption | US403721 | 1982-07-30 | US4449187A | 1984-05-15 | Charles F. Scott |
| An electromechanical device for indirectly monitoring consumption of a utility in the home or commercial environment, using a clock to measure the time of operation of the utility consuming device and a calculator to convert the measured time into a cumulative monetary figure denoting the cost of the utility consumed. | ||||||
| 13 | Electrical measuring instrument | US44630121 | 1921-02-19 | US1582699A | 1926-04-27 | SMITH BENJAMIN H |
| 14 | Electric meter. | US1903174317 | 1903-09-23 | US782030A | 1905-02-07 | HOLDEN FRANK |
| 15 | Electricity-meter. | US1900002118 | 1900-01-20 | US656100A | 1900-08-14 | EIBIG PAUL |
| 16 | hummel | US623547D | US623547A | 1899-04-25 | ||
| 17 | Electric meter | US621005D | US621005A | 1899-03-14 | ||
| 18 | Electric meter | US548755D | US548755A | 1895-10-29 | ||
| 19 | Electric meter | US539886D | US539886A | 1895-05-28 | ||
| 20 | Electric meter | US428649D | US428649A | 1890-05-27 | ||
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